*,
*::before,
*::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

:root {
  font-family: 'Pretendard', system-ui, -apple-system, sans-serif;
  line-height: 1.5;
  font-weight: 400;
  color: rgba(255, 255, 255, 0.87);
  background-color: #2E2C2F;
  font-synthesis: none;
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  min-width: 320px;
  min-height: 100vh;
}

a {
  color: #BACDB0;
  text-decoration: none;
}

a:hover {
  opacity: 0.85;
}

/* ── Game asset common classes ───────────────────── */

.btn-game {
  position: relative;
  display: inline-block;
  border: none;
  color: #fff;
  padding: 14px 40px;
  font-size: 1.1rem;
  font-weight: 700;
  cursor: pointer;
  background: url('/images/btn_normal.webp') center/100% 100% no-repeat;
  letter-spacing: 0.05em;
  overflow: hidden;
  text-decoration: none;
  transition: transform 0.15s, filter 0.15s;
}
.btn-game:hover { transform: translateY(-1px); filter: brightness(1.2); }
.btn-game:disabled { opacity: 0.5; cursor: not-allowed; transform: none; }
.btn-game > * { position: relative; z-index: 1; }

.card-game {
  position: relative;
  background: rgba(0, 0, 0, 0.6);
  border-radius: 12px;
  overflow: hidden;
}
.card-game::before {
  content: '';
  position: absolute;
  inset: -8px;
  background: url('/images/card_frame.webp') center/100% 100% no-repeat;
  pointer-events: none;
  z-index: 0;
}
.card-game > * { position: relative; z-index: 1; }

.divider-game {
  width: 100%;
  max-width: 400px;
  height: 20px;
  background: url('/images/divider.webp') center/contain no-repeat;
  margin: 2rem auto;
}

@media (max-width: 768px) {
  .card-game::before { display: none; }
  .card-game { border: 1px solid rgba(186, 205, 176, 0.3); }
}